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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

Carrying Capacity

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sethp001
Mainsheet C-25 Tech Editor

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814 Posts

Initially Posted - 09/03/2014 : 17:36:15

I've not found anything to really help me with this question when searching the Internet. I though perhaps you sailors might know the answer to this question, either specifically or by guideline.

How can one calculate or estimate the carrying capacity of a sailboat? This question comes from a recent experience sailing our Catalina Capri 14.2 to Power Squadron Spit in the Cape Lookout area of North Carolina. We camped on the spit, and carried substantial camping supplies in the storage area forward on the boat.

As you know, the Capri 14.2 is a planing centerboard, and typically points well. However in this case the boat sailed like a pig, and we could not sail to windward at all - a broad reach was the best that we could do - so we motored much of the way.

Is this because we overloaded a planing sailboat? Or does this also happen when overloading a displacement sloop? And does anyone know how to calculate or estimate carrying capacity of a displacement sloop?

Edited by - on

sethp001
Mainsheet C-25 Tech Editor

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814 Posts

Response Posted - 09/05/2014 : 17:54:32

Bueller...?

Bueller...?

Bueller...?

Edited by - sethp001 on 09/05/2014 17:55:30

Stinkpotter
Master Marine Consultant

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Djibouti
9088 Posts

Response Posted - 09/06/2014 : 08:35:18

Not me... But I suspect the ability to sail to windward starts to decline as the drag on the hull due to its immersion level approaches or becomes greater than the lift capability of the keel (or centerboard), which declines with speed. Weight might induce that earlier in a relatively light centerboarder than a heavier keelboat. A naval architect could probably estimate this form of "capacity", but it probably is affected by several design factors such as size of keel/centerboard, wetted surface of the hull vs. keel, beam relative to length, S/A to displacement, etc.

Edited by - Stinkpotter on 09/06/2014 08:37:49

pastmember
Master Marine Consultant

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2402 Posts

Response Posted - 09/08/2014 : 09:10:03

Years ago I believe someone had a figure, something like every 900 pounds lowers the water line 1 inch or something like that.

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Stinkpotter
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Djibouti
9088 Posts

Response Posted - 09/08/2014 : 13:03:09

That would be LWL * mean beam at the waterline / 12 * weight of 1 cubic foot of water (fresh < salt)...

22 * 5(?) / 12 * 63 = 577 lbs would lower the C-25 hull 1".

(The beam is the tricky part.) I'd say 600 lbs. is a reasonable approximation.

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.